SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105e8f2ed6ebd52ea3413bb9683b188f9b9f30ba861123ff10c23c023e1f7cd7' 
  AND token = 'lOdc6ip/RfifQu+4UGxJSz8vawmVPYXVO5wRdvidXjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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