OK. Then you're just fine. In fact, you could use 2x4's, but I assume you're matching floor height somewhere else? Also, you gonna insulate in there?
You will absolutely need a vapor barrier between the concrete and anything that goes on it. So, 4 mil plastic down first, then your joists, ply, and flooring. Insulate if you want a warmer feel.
Concrete will suck moisture from way over there and you will get build-up in that air space unless you put in vapor barrier. It would take time, but it will happen, and that could lead to mold on the underside of the ply.
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