SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3d90dc5e73a7ef556f00e4b6ec724be5ab46a5c6b7de81b03a4b53ec1d07e2' 
  AND token = 'nziDJdG8hZZEH7Ld98LWh+2Ng/Q+BJlnOYGQzxMapjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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