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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f3d4de7efd703dbc23e4884276e62b666a394f13ef90cf747e9f915d9ed526' 
  AND token = 'SaWSfuI7bIZzlTAyNNfIUeCP5DwhpD1HSCQhxe2MeDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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