Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d48b155efbd3625bbd6db1751777d4226c2e1e2580079a57308c81c160d6c9' 
  AND token = 'bFISEdEYGyCkh9OTQpfM5JjwBRo+STO4MdGy7orYeSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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