Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886d16e2d823b45d6979118beecf68840adb56aa9d25dece5cb2d3dc8f93e873' 
  AND token = 'uY0n961FdDNdj3ITxS9/jokd4o9LyOGp6CY655L2TBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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