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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a342b58fa71290c54cdf3c16776a5f955301b9193cda4baee2686513f62c9e0' 
  AND token = 'Xpt4ED1/IfZesmt67tEaiXeJ+WMXj37FHe53Y3WvLY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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