SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf0e2c0b323934c81495b9313b676453028b5e24cc530620a7cb3c6d8d7e8b5' 
  AND token = 'Bw5MW4jo8DCsgfapvRJ4E9WVEB43/bovXU95hGu5qoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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