SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbbf08aa8554ad04dcac4cf6b73aee1dc16e7835d7c8e4639e3dac5a7a1b66a' 
  AND token = 'Psr9jclimr8PZiIfN8ytHaO9fjhIqmdx/uxE/4VBVRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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