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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b217aa51ff7bd52d621a612f283324e7a79357e6ace3b65ba1c658094af4f13a' 
  AND token = 'V9Pt9LMW6ZQ0ancdMltx0ipQQjaUzbsxW7AZIuQiKLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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