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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67704570f8440eac4a3e291698616b944f6ccf29a872eccddaeb4aacff56d985' 
  AND token = 'nttcRwnSpFSwXazH8tuukLr6KtgQdDe2p3P+DeNHJRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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