SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0c324241fdc978ac22f5df23067bf39e73779b360995e2bf1e5ff9e74f843e' 
  AND token = 'x+PhVq0ZPvx2aK7rtYaIPTGC23SXpCgISKWbgLquOeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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