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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b9c860386ff0588438d9351b718fdf3b33cfb3be4a6e225820b9dfd0ce9f79' 
  AND token = 'hb6OGL0Tn0sq6yYYksdVl3ggQwB3PNZpCDX+OaWRfkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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