SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68caba43918938d9b8c95e472474266017445d4adebf5102b1b6adb0217d9b8' 
  AND token = 'bnoJNwsqNPC8jz/dbDynY6Kq9CzVoM5rfl+GNVQHEUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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