SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496e67b990f17efbecd93322e16f3d49a2f3e2ae9d25a72d1a95801ab2a07d9b' 
  AND token = 'bRdaj2tJKDF/0k1dFyPuDa8NiNItD+mir9cLzBxRdnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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