SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb2396013d0efdec20b34b5de91017fdecfa188555ab79ef74497e49ba9fd0f' 
  AND token = 'L9jjJE62en7+SJXcz/Hq9Z283kj9goJk9NmW4mVzINI=' 
  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