SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c5d49c7e130024e6a4c0847d0d122384779dd39a98df2ff303067dea3d0901' 
  AND token = 'o6x4Z1KSyT9E/cSupUNS5gS4hBTo5MnHZIYYS2a/7qM=' 
  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