SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47707bad2a9f5be3dfce86f10048be82258f687b37c214ea73aae9dcdc04e59e' 
  AND token = '1+NuWJvYIXgvUSM8u89S7NfD24jhQicpqfb3vDSwGTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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