SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c39530130fd205f7f42b450ebb3ea4299ed95cef8a05920ac0f0c782d094d5' 
  AND token = 'YI6Gl5O61gYVsmbhOdJjL0lF06pQ4wGgY+YYBCHdvGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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