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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aba9bc52ee2f7f31471dbe92072681439b248d6f108ccffaf70d35d2fd9a727' 
  AND token = 'RS0eBvygPngw3l94j7nE1zltOruvGZ1CZpaeWYlZ4bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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