SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c412da609df508db44cd2d99fbcda9b8ea737c9c868d663f4548e12729d5b843' 
  AND token = 'FFTdn92jmoEaZncWrzKvXMbbH6iSRP3aTyiDEUQiUEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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