SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d0f760cb9601024c9efb77dd754e7fff599daa646f5ec3d11c499d58edb0a9' 
  AND token = 'YPn0llPCTuGIR00oiyeCkj6C5vGCF+0jEetf4VvOTnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables