SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40844042df3b84943094ca3e498ef4fc827ac774546c57c09e71488085be5d3d' 
  AND token = 'joEJjAuHkICVE9fWR+IBDUuhLWcxC06UB7mOl0kBzMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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