SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d83a62b893fe9fbca6d7805bd9c08e882264b142b344c3454298f5b6f527bf4' 
  AND token = 'V2UIICtjE+SywgkbUwpuphDGsL+LiuH2lWwRw609Z0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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