SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86a05d1359e5e054cf75117668202ad58e7fa6faa389b423f1774f876dd9f9b' 
  AND token = 'lNM6b+Fue/wYkNkz2TvHSFxEzu5Xj9Az6aVLZBU5WYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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