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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb19685ed9b5419c2af6a8184a1e8f373b1503d468f7feda44db40f9133774b' 
  AND token = 'd8b0X11aUkaTTuDxbfDThBnRRlXhoG28YSA0lKvVu9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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