SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65b6b82d277ca73adc7966ee9c3382279907bd3b207731cc54a40c51d7f1a93' 
  AND token = 'W92KAQRnNZGcpI6kihlJrXnwa0t+kwWeGlRJ4jtzc8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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