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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ffd33b3e1f003e0633fde8d828b162ab5a82d050982d9b0a9fe9caa07b2259' 
  AND token = 'JrMPaJ+Z3+WzvL8Z2uyz0D7soMnVqKGqpCMrpc5QHao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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