SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f5fbd233ff7fac00e9f658642e1ae75d9c2323253fd4623f12aa71f5fd01ed' 
  AND token = '6zGkRtIZ/ruTncYbx0BlwyoKCNJxc19soYyyj2RtRRY=' 
  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