SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58e7e1d0a9196dcc0d700416835c0051772ac7469a801fa9b6167bc8dda5d0f' 
  AND token = 'fn+0RPxxmMoAiKo6VePTKWz+GnGbW0fMtEUtlXlETfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables