Is it OK to review a manuscript written by an editor who handled (and accepted) one of your papers?
Short answer: yes it is ok to accept the review.

Long answer: Yes, it is (still) ok to accept the review. If you can only review paper written by authors you have never ever interacted with, at some point in your career, you'll stop reviewing. Especially if you are working in a small field of research. For me, in your case, it is more than fine to accept the review. The question becomes more tricky if it is from someone you work(ed) with...

If you want to try out some really tricky reviewing scenario, try out this test: http://blogs.biomedcentral.com/bmcblog/2015/08/21/quiz-can-navigate-tricky-peer-review-scenarios/