SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7261c2263ab103a04e1b703f46cb16d05b2ec3d915c62474f77273e60d79b4ac' 
  AND token = 'qwA/97tyNrRzaP8M3IUCRW+LZVp/ozWc4JZzBYfeOCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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