Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828bbe4640081af517c88b246f3b96cb25f0de06d69630cedc13b84745883337' 
  AND token = 'aHmZZE1VeHcjEpSzI7FbjPFSjOcMek6ZB56HA1p0pC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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