SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ab434c9fce742d357a770788679f6546adf5dfede9108bbf8fdc3ee2e0c197' 
  AND token = 'SQZYo04DBJ47h9LJCoYlfoZkUBVZDcWJNvk/WkRGhtE=' 
  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