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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd471d769aa39db3d6641b6a5df8c1ac7d449e13543dde2f00571d696bbec28' 
  AND token = 'HaNxF9EeR99mbb2pwDi5BTEuDlla1vkkcDl3V72Zuwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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