SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb65dda54cd143b3a8768b9a9280b05f6c4405eb1490c7b52d45939d5319aa7b' 
  AND token = 'cugPLlR7wj+sZy3It9FCZT4s060Z5CWAqn/ZZa5XKWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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