SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4468de2e32890fb8ed3e7dffb9265776b6f7fb6c14f2756770a8ade806d908d6' 
  AND token = 'pAGnCq+wjOawG77mWzHgc99xuwH0jVrDQ+vpFPyEILM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}