This should do it. Tested locally and it works.
// Hide 'included' and 'not included' custom meta fields
// from the edit 'excursion' post type page.
function my_exclude_custom_fields( $protected, $meta_key ) {
if ( 'excursion' == get_post_type() ) {
if ( in_array( $meta_key, array( 'included', 'not included' ) ) ) {
return true;
}
}
return $protected;
}
add_filter( 'is_protected_meta', 'my_exclude_custom_fields', 10, 2 );