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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b69e5ecefb25f4279e2ad28217e51ce5aaa9effecc9dbf9bb3f94f383e3b41e' 
  AND token = 'zuEITGobJ6QgvL79WeimigYqtC65vpxUrHeFM7LiRUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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