SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83df15a8374c14a01f2dacd4012dcb1cf56e1d72b38cc6934db2d7319e435fd0' 
  AND token = 'YvNJO4pnAAGnWfmFLkJVUrw1/+Nfj2g4+/ihZvsEgAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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