SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae18e4dc0c05fe6950c789409bcbe7862e6c1ffeb46479ad8a095f138a16792c' 
  AND token = 'ZmGnreOJ9DMu8I/EP27ZnTaKevS5g7jsbG7TdvF7se0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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