SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59870e657ca0a9fe30987ad5f8e358f6e548088de847896cb410d7f2ba74dea' 
  AND token = 'TcTIf+f7ffKxHpnWiog/eJut+kCzGqdCdmtHVfzWQss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

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