SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e220d63b1db8859ab04d0cd96b3cc2b2b753a1de562d8f7f5453ca4a27a447fa' 
  AND token = 'fYExwqv8yrMLauymZKFoXZqujPH1lQEvCLej1cB8cvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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