SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f4433d36f981b441c944a5ed6dea5eea15a7234aa46f482c1b0e9d6925d2f1' 
  AND token = 'u6GKRqIvY22eqlGf4Qmp5NVfO2JQshKIUmOBv2XGg/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}