SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b076c4f767f2a677e5ac950f8ed9718e446c32159d30c12370d376dd77b0c7' 
  AND token = 'qHj0YNG+2hwqln+Iip93DcHVMRJ/ge+0WlGNtTAqzxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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