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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4828baf9ab5e1680c153f8147313022a607d164c1785453fc2d7bb19aa315cd7' 
  AND token = 'JsYklmPCvYAh23UFeI9O9E/7M/mnKyW4L36vEt+iH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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