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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb7297760a43dde16d1dba545b9e1ec9c70d56c29a7da3c08300a42882c0f48' 
  AND token = 'egH0XLECXGWD5YDwkHL67pNbV2DXhzP8kq0qe855Btc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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