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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3c2e5edd12b26c49baeea9459e0506eb214f1da1467ca98c341a2830256dec' 
  AND token = 'wR0wlhCYqjqplQrOzlWAm/LmvxaFfHSyyuJl67wIv40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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