The ACF google map field stores a serialized array of values. It is impossible to search these values in the manner you describe.
In order to do a search on longitude and latitude you would need to create an acf/save_post filter. In this filter you get the value of the ACF google map field without formatting.
$value = get_field('map-field-name', $post_id, false)
You would then save these values into WP custom meta using update_post_mata(). You can then uses these fields for your search.