SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8da75ab9d9a6f23682b34675a81f2538a3631908674f7c2dbcccc9ca635bcf' 
  AND token = 'TRQU1KL1Jyz39YnrYPNzZ1BhIlIW9m1gugZQbE8VWUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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