SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25895aba3ea4cec6387e9f9c300998b8a6911550eb059216e8ff52d258fdc7bf' 
  AND token = 'AUHZLG4zLccz+9HbPywPvoqT8l4PBNIf+NY7hSwV3XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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