SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0230b40f1d72f5df16e8899bc5f1c5b944d39e66c007f9f75ffcfda541357e5f' 
  AND token = 'YlhYTCWaE6mSpIxhQ56Hh4sVWvJHYITGzaZLuIIamUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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