If you have the privileges, you can use the ALL_INDEXES or USER_INDEXES views. The query would be:
SELECT *
FROM all_indexes
WHERE table_name = 'COUNTRY';
If you want some information on the columns included in the index, you can select those from ALL_IND_COLUMNS. Documentation regarding these views can be found here Static Data Dictionary Views: ALL_ALL_TABLES to ALL_MVIEWS
