SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87667fd407b3b69255b38009f323c816dcd2f00f2a8709c03ff10b4f1adac8cc' 
  AND token = 'io0+yoYRwVfdaQ6SE9R44jR08kcY14xYhZs3EpitnYA=' 
  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