SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4837be091c26b10b8439dcf12c6e4f638651b55d64ebc5a769e2b876cfb4550' 
  AND token = 'hHXjI9kqE7ENWGvvEKQt6zrzXzTHBTzBjYBLvCY4zd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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