SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b74eafb595c130f7202d637c63d3921b4302650ebda80c0bbfea541fe0ff77' 
  AND token = '0Bq1FAmoE6Z/KaDoJh4gYchxWPNXuivQAYX3GXpxEHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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