If by civlization, if you mean sedentarism, it is possible to have settled
sites without agriculture provided that local resources are rich enough all
year round. This occurred in areas of early Meso-America and the Pacific
Northwest, where coastal, riverine and estuary sites were rich enough in
fish, molluscs and wild plants to allow sedentary life. I don't know,
however, that Central Asia would have had similar environments.