SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c4eefb6dece33e70f57ecc47c1c707f9ce076f86e117c814254d61ee8c2711' 
  AND token = 'XrI/0EstnNK/iKW4T88Xg+dkH2prXW4uknCgCP7JMhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

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