SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe6be570c5dcf2f45ed8dfde1a4eaa7f83674c303ff3616da34d82565b9fa27' 
  AND token = 'WJQXkDbkfdZmQxWgblMLZVkE9jJPIJCFozbDVhYVRDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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