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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d8cd1a7ed32226c314e6e92fc246e5ca8f6e039cdda10354372f95f6ac36ad' 
  AND token = '+wb8hwEJY9r26GMSIICBQWRlT64tSd2Dx07rfIQcFbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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