SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86b17013571ad22208475e84ef73e774d0b8dc2b1b5aa8fb587fc5b9875bd98' 
  AND token = 'BdZWncuidK48qbwI02Ypw7bFvT60BV2oI/SpE0erwYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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