How to disable GET requests to index.php using .htaccess?

Question

htaccess

In the access.log of my server I constantly find requests of the following form:
GET site.ru/?page=Avtomati-na-realnie-dengi
Now I have banned all requests starting with the word "page" with the following construction:

#Блокируем ботов
RewriteEngine On
RewriteCond %{QUERY_STRING} page= [NC]
RewriteRule ^.*$ - [R=404,L]

Question: how can I redirect to the 404 page all requests like www.site.ru/?xxx=xxx and www.site.ru/?xxx where xxx are any characters to the index.php file through the .htaccess file?