SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f11c873bbba1ac07f20d6f58bd5aefb1d38fed635d5bd499850b43ae0622c09' 
  AND token = 't3Wj0hqorDFx4Wh9YRC7WSzz7gjYp+mvZRUVXgMKhaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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