Add filter conditionally to a page

Question

I am using a filter to change a label on a particular page and set the rest the same.

add_filter( 'woocommerce_product_single_add_to_cart_text', 'themeprefix_cart_button_text' ); 
 //Add New Pay Button Text
function themeprefix_cart_button_text() {
    if(is_page(3601)) :
 return __( 'Buy Now', 'woocommerce' );
    else:
return __( 'Add To Cart', 'woocommerce' );
    endif;
}

But not working - anything wrong with the conditional code?