SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92457fb668692de03809b148bbd976465739a0a47deedc6812fc4327537d3ea2' 
  AND token = 'U5999fJ10m0A/5dKw/YvatmJdZoBtq2L2BotwMKKltk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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