SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff468a94e78af5d7458a8db4e8061c0afa54bd07655d9a37e88f8bd50e176fc' 
  AND token = 'pJ1xTMnPzI45lWQ1s/0oENg1HjRa5TcRFA/REb/ue8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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