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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '453d79ec7ba9d91afe833e9b209d19797cecdceee0338a5c6492410ab03d18b6' 
  AND token = 'bxZPZ3eM81VWPFDNx7Z9Wfa4aZ7rHvSmrRSGDTYlmi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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