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So I am about to Drylok my basement to treat old cinder blocks with a hint of moisture. I have the old asbestos tiles on the floor. I know the dangers of removing these. Basically all of the tiles along the wall have popped up due to moisture. So I have the bare slab meeting the wall at the base.

Should I Drylok down to the slab and a couple inches over, or is there some kind of masonry caulk to put down where the slab meets the wall?

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The waterproofing material's spec sheet will tell you how wide of cracks it's designed to accommodate. That should be your guide. If your joints are wider than that, move to a caulk. If they're extremely wide (over 3/8" or so), consider a rope caulk or a masonry patch product as support for the sealer product.

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