SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1111850f3156079eea52a78de9df16e714cdc588d22239ffcb56308b59cecc' 
  AND token = 'voLh8tu3VqxzDiJoc+iAJgi+jFjKyMg6jZ7GkcGQsoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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