SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0732965de4de6ef616a9857d9de16f982bcfacac82a8e905ff753bed64c43375' 
  AND token = 'jp1enB3PQagVQvYfGOJX1ZCQYW11FUMWzlh+ag4bsKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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