From Codex:
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taxonomy-{taxonomy}-{term}.php – If the taxonomy were sometax, and taxonomy’s slug were someterm WordPress would look for taxonomy-sometax-someterm.php. In the case of Post Formats, the taxonomy is ‘post_format’ and the terms are ‘post-format-{format}. i.e. taxonomy-post_format-post-format-link.php
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taxonomy-{taxonomy}.php – If the taxonomy were sometax, WordPress would look for taxonomy-sometax.php
There is no custom post type custom taxonomy archive page. Custom taxonomy can exist without custom post type. So what you need is a taxonomy template.