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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e5363289ba1b6bce35ae0d6b011844a435c0e0593810946f24833d81723b5e' 
  AND token = 'm8buLCfP/e8ISKCjBBLeKyi3pwjd6c0wa8s3MqF5c/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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