SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7571b7db1e339b3d3e3b48639021c455dfa82f3907b2868e290bfa37bfb7f5c2' 
  AND token = 'V24JNLstWk4jVZ/nnZRCTb17j35WqHqW0RQhiWYxVrg=' 
  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