SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57674694df50d4738e5761589abfc5f2fba41ae3819824223d3e4acf8eb75745' 
  AND token = 'wd6ElmbCgQi2sbEvQsWPl6efjardFVtYvK/1kpqBWfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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