SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7647e8196d47d49fda098bbc54990bd623590f12e11692096b439c782f75c7' 
  AND token = '4y0jmHRJXcpm+tDzMdjlok+IgBc/ySgpBS9yG3HKOpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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