SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4773b50296a4f288513e26bb86c96ad498840ccba9799ff045fc10679df87c8b' 
  AND token = 'LZpcWBvuCB/uk3Dj2eGk4o7bukWwPiOkKdaJgiaLsxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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